Having put the hosts in front, the Cameroon worldwide incredibly contrived to stop Christopher Nkunku's goal-bound effort at 1-1, and was unable to even turn to the ball into the net.
Needing a win to be crowned champions of France's Ligue One at home, PSG had its title celebrations delayed for at least another week after Maxim Choupo-Moting accidentally prevented a goal for his team despite the ball being about to cross the goal line.
Thilo Kehrer came to the rescue late on for the hosts after a shock defeat was on the cards, but had they won they could have celebrated another Ligue 1 title.
Choupo-Moting, who scored the opener for PSG, was replaced by Mbappe on the hour mark.
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I thought that the defender was maybe going to take the ball and, after, I hesitated to take the ball, I asked myself if I was offside and everything went very quickly.
We could call this an embarrassing miss (because it was), but really, Choupo-Moting shouldn't have touched the ball at all.
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However, that was not enough for them to bag full points, as Tristan Dingome teed up Remi Oudin's goal 12 minutes from time.
When everyone thought it was going to be 2-1, Choupo-Moting thought of stopping the ball on the goalline.
Choupo-Moting had given the champions-in-waiting the lead after 13 minutes before Nuno Da Costa's leveller.
PSG are 20 points clear at the top of Ligue 1 ahead of Lille and they will have to wait a little longer to earn another incontestable league title.
Second-placed Lille have 61 points from 31 matches.
Tuchel was then sent to the stands on 58 minutes for verbally challenging the referee, with Mbappe and Julian Draxler entering the fray shortly after to try and salvage the game.